636406936 has 64 divisors (see below), whose sum is σ = 1361203200. Its totient is φ = 276307200.

The previous prime is 636406933. The next prime is 636406963. The reversal of 636406936 is 639604636.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 636406892 and 636406901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636406933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214036 + ... + 216988.

It is an arithmetic number, because the mean of its divisors is an integer number (21268800).

Almost surely, 2^636406936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 636406936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680601600).

636406936 is an abundant number, since it is smaller than the sum of its proper divisors (724796264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636406936 is a wasteful number, since it uses less digits than its factorization.

636406936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080 (or 3076 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 43.

The square root of 636406936 is about 25227.1071666967. The cubic root of 636406936 is about 860.1581356942.

The spelling of 636406936 in words is "six hundred thirty-six million, four hundred six thousand, nine hundred thirty-six".